fix(tui): add width bounds and y‑position clamp for popups

- Limit popup width to a configurable range (40‑80 characters) and ensure a minimum width of 1.
- Preserve original width when the terminal is narrower than the minimum.
- Clamp the y coordinate to the top of the area to avoid negative positioning.

crates/owlen-tui/src/ui.rs

@@ -3768,17 +3768,21 @@ fn render_command_suggestions(frame: &mut Frame<'_>, app: &ChatApp) {
     let mut height = visible_count.saturating_mul(2).saturating_add(6);
     height = height.clamp(6, area.height);
 
-    let mut width = area.width.saturating_sub(10);
-    if width < 50 {
-        width = area.width.saturating_sub(4);
-    }
-    if width == 0 {
+    let max_width: u16 = 80;
+    let min_width: u16 = 40;
+    let mut width = area.width.min(max_width);
+    if area.width >= min_width {
+        width = width.max(min_width);
+    } else {
         width = area.width;
     }
-    let width = width.min(area.width);
+    width = width.max(1);
 
     let x = area.x + (area.width.saturating_sub(width)) / 2;
-    let y = area.y + (area.height.saturating_sub(height)) / 3;
+    let mut y = area.y + (area.height.saturating_sub(height)) / 3;
+    if y < area.y {
+        y = area.y;
+    }
     let popup_area = Rect::new(x, y, width, height);
 
     frame.render_widget(Clear, popup_area);